Garmin 3X5 User Manual

GTX 3X5 Series Transponder

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Pilot's Guide

© 2015 Garmin Ltd. or its subsidiaries. All rights reserved.

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This manual refl ects the operation of GTX 3X5 Series Transponders.

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December 2015 Printed in the U.S.A.

LIMITED WARRANTY

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All Garmin avionics products are warranted to be free from defects in materials or workmanship for:
two years from the date of purchase for new Remote-Mount and Panel-Mount products; one year
from the date of purchase for new portable products and any purchased newly-overhauled products;
six months for newly-overhauled products exchanged through a Garmin Authorized Service Center;
and 90 days for factory repaired or newly-overhauled products exchanged at Garmin in lieu of repair.
Within the applicable period, Garmin will, at its sole option, repair or replace any components that
fail in normal use. Such repairs or replacement will be made at no charge to the customer for parts
or labor, provided that the customer shall be responsible for any transportation cost. This warranty
does not apply to: (i) cosmetic damage, such as scratches, nicks and dents; (ii) consumable parts,
such as batteries, unless product damage has occurred due to a defect in materials or workmanship;
(iii) damage caused by accident, abuse, misuse, water, fl ood, fi re, or other acts of nature or external
causes; (iv) damage caused by service performed by anyone who is not an authorized service
provider of Garmin; or (v) damage to a product that has been modifi ed or altered without the written
permission of Garmin. In addition, Garmin reserves the right to refuse warranty claims against
products or services that are obtained and/or used in contravention of the laws of any country.

THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL OTHER
WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING ANY LIABILITY ARISING
UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE,
STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, WHICH MAY
VARY FROM STATE TO STATE.

IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES, WHETHER RESULTING FROM THE USE, MISUSE OR INABILITY TO USE THE PRODUCT OR
FROM DEFECTS IN THE PRODUCT. SOME STATES DO NOT ALLOW THE EXCLUSION OF INCIDENTAL OR
CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATIONS MAY NOT APPLY TO YOU.

Garmin retains the exclusive right to repair or replace (with a new or newly-overhauled replacement
product) the product or software or offer a full refund of the purchase price at its sole discretion.
SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY.

Online Auction Purchases: Products purchased through online auctions are not eligible for
warranty coverage. Online auction confirmations are not accepted for warranty verification. To obtain
warranty service, an original or copy of the sales receipt from the original retailer is required. Garmin
will not replace missing components from any package purchased through an online auction.

International Purchases: A separate warranty may be provided by international distributors for
devices purchased outside the United States depending on the country. If applicable, this warranty is
provided by the local in-country distributor and this distributor provides local service for your device.
Distributor warranties are only valid in the area of intended distribution. Devices purchased in the
United States or Canada must be returned to the Garmin service center in the United Kingdom, the
United States, Canada, or Taiwan for service.

To obtain warranty service, contact your local Garmin Authorized Service Center. For assistance in
locating a Service Center near you, visit the Garmin web site at http://www.garmin.com or contact
Garmin Customer Service at 866-739-5687.

Garmin GTX Pilot’s Guide

i190-01499-00 Rev. 1

WARNING: Do not use data link weather information for maneuvering in,

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near, or around areas of hazardous weather. Information contained within
data link weather products may not accurately depict current weather
conditions.

WARNING: Do not use the indicated data link weather product age to

determine the age of the weather information shown by the data link
weather product. Due to time delays inherent in gathering and processing
weather data for data link transmission, the weather information shown by
the data link weather product may be signif cantly older than the indicated
weather product age.

WARNING: To reduce the risk of unsafe operation, carefully review
and understand all aspects of the GTX 3X5 Pilot’s Guide. Thoroughly
practice basic operation prior to actual use.

WARNING: The display surface is coated with a special anti-reflective
coating that is very sensitive to skin oils, waxes, and abrasive cleaners.
It is very important to clean the lens using an eyeglass lens cleaner that
is specified as safe for anti-reflective coatings with a clean, lint-free
cloth.

CAUTION: The Garmin GTX 3X5 should be turned off before starting or
shutting down aircraft engine(s).

NOTE: This product does not contain any user-serviceable parts. Repairs
should only be made by an authorized Garmin service center.
Unauthorized repairs or modifications could result in permanent
damage to the equipment, and void your warranty and your authority to
operate this device under FCC and FAA regulations.

NOTE: This product, its packaging, and its components contain chemicals
known to the State of California to cause cancer, birth defects, or
reproductive harm. This notice is being provided in accordance with
California’s Proposition 65. If you have any questions or would like
additional information, please refer to our website at
www.garmin.com/prop65.

NOTE: The coverage expected from the GTX 3X5 is limited to line of
sight. Low altitude or aircraft antenna shielding by the aircraft itself may
result in reduced range. Range can be improved by climbing to a higher
altitude.

ii

Garmin GTX 3X5 Pilot’s Guide

190-01499-00 Rev. 1

NOTE: It is the responsibility of the GTX 3X5 owner to obtain

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proper licensing before using the transponder.

AC 90-100A Statement of Compliance:

The Garmin navigational unit meets the

performance and functional requirements

of AC 90-100A.

Garmin GTX Pilot’s Guide

iii190-01499-00 Rev. 1

Product Registration and Support

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Help us better support you by completing your online registration today!
Registration ensures that you will receive notifications of product updates, new
products, and provides lost or stolen unit tracking. Please, have the serial
number of your unit handy and connect to our web site (www.garmin.com).
Look for our Product Registration link on the Home page. Also, be sure to

record your serial number in the space provided.

To obtain accessories for your unit, please contact your Garmin dealer.

This guide is available in pdf format at www.garmin.com/manuals. If you have
any questions, the Garmin Product Support department may be reached
Monday through Friday, 7:00 AM to 7:00 PM Central Time.

US: 913-397-8200

US Toll Free: 1-866-739-5687

Canada Toll Free: 1-866-429-9296

Record of Revisions

Part Number

190-01499-00

iv

Revision Date Description

1 12/18/15 Initial release

Garmin GTX 3X5 Pilot’s Guide

190-01499-00 Rev. 1

1 GTX 3X5 Series Transponders ............................................ 1-1

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1.1 GTX 335 .......................................................................... 1-1

1.2 GTX 345 .......................................................................... 1-1

1.3 References ........................................................................... 1-1

1.4 Acronyms and Abbreviations .............................................. 1-2

2 GTX 3X5 Controls .............................................................. 2-1

2.1 Power Control Keys ......................................................... 2-1

2.2 Mode Selection Keys ........................................................... 2-1

2.3 Squawk Code Keys ............................................................. 2-2

2.4 Function Keys ..................................................................... 2-2

3 Features and Settings .......................................................... 3-1

3.1 Transponder (XPDR) .......................................................... 3-1

3.2 TIMERS (TMR) ................................................................... 3-2

3.3 ALTITUDE (ALT) ............................................................... 3-3

3.4 SYSTEM (SYS) .................................................................... 3-4

190-01499-00 Rev. 1 Garmin GTX 3X5 Pilot’s Guide v

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vi Garmin GTX 3X5 Pilot’s Guide 190-01499-00 Rev. 1

Figure 2-1 Squawk Code Entry Field..................................... 2-2

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190-01499-00 Rev. 1 Garmin GTX 3X5 Pilot’s Guide vii

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viii Garmin GTX 3X5 Pilot’s Guide 190-01499-00 Rev. 1

1 GTX 3X5 SERIES TRANSPONDERS

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The GTX 3X5 Series Transponders is a family of panel mount and remote
transponders.

• GTX 345 Mode S transponder with built-in ADS-B UAT and 1090
MHz receivers

• GTX

1.1 GTX 335

The GTX 335 is a TSO compliant mode S transponder with ADS-B Out
Extended Squitter functionality.

Features:

• Traffic Information Service (TIS) traffic display output and aural

• Altitude deviation alerting

• Timers: count up, count down, flight, trip

• Static (Outside) air temperature display

• Density altitude display

•

1.2 GTX 345

The GTX 345 is a mode S transponder with TSO compliant ADS-B Out
and ADS-B In functionality.

transponder with ADS-B Out and ADS-B In functionality.

335 Mode S transponder with ADS-B Out functionality

alerting

Internal GPS (Optional)

The GTX 345 is a TSO compliant mode S

Features:

• Dual-band ADS-B traffic display output and aural alerting

• Helicopter specific Airport Area Alerting and On-Scene Mode

• Integration with TCAD/TAS/TCAS I traffic systems

• FIS-B weather and flight information display output

• Bluetooth portable device interface to traffic, weather, and AHRS

• Altitude deviation alerting

• Timers: count up, count down, flight, trip

• Static (Outside) air temperature display

• Density altitude display

•

Internal GPS (Optional)

1.3 References

ADS-B Academy

190-01499-00 Rev. 1 Garmin GTX 3X5 Pilot’s Guide 1-1

1.4 Acronyms and Abbreviations

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AAD Automatic Airborne Determination

ADSB Automatic Dependant Surveillance Broadcast

ATCRBS Air Traffic Control Radar Beacon System

ASR Automatic Speech Recognition

PIREP Pilot Report

SSR Special Position Identification

SPI Special Position Identification

TCAS Traffic Collision Avoidance System

1-2 Garmin GTX 3X5 Pilot’s Guide 190-01499-00 Rev. 1

2 GTX 3X5 CONTROLS

NOTE

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The GTX 3X5 series transponders share common pilot interface.

2.1 Power Control Keys

Regardless of the operating mode, the GTX 3X5 will not
respond to
or Mode S All-Call interrogations if Automatic Airborne
Determination (AAD) senses the aircraft is on the ground.

Air Traffic Control Radar Beacon System (

ON

 P

owers on into ON mode

ALT

 P

owers on into ALT mode

ATCRBS)

.

.

OFF

SBY

2.2 Mode Selection Keys

The transponder becomes
or

ALT

function is selected

TCAS equipped

SBY  Selects the standby mode.
interrogations or transmit ADS-B Out

ON  Selects the On mode.

(

) symbol indicates the transponder is actively responding.

The GTX 3X5 transmits
include altitude information.

aircraft.

ALT  Alt mode takes into account the air/ground state. The transponder

190-01499-00 Rev. 1 Garmin GTX 3X5 Pilot’s Guide 2-1

 Powers off.

 P

owers on into standby mode.

an active part of the

.The

transponder responds to interrogations from

The transponder will not reply to any

.

The transponder replies to interrogations. The

ADS-B

Out data.

Replies and ADS-B Out data do not

ATCRBS

when either the

ON

Reply

replies to identification and altitude

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interrogations as indicated by the Reply

symbol

The GTX
ADS-B

(

).

3X5

transmits ADS-B Out data. Replies to altitude interrogations and

Out data include the aircraft’s standard pressure

altitude.

2.3 Squawk Code Keys

There are eight squawk code entry keys (0 – 7) that provide access to all
ATCRBS codes. Pushing one of these keys begins the code selection
sequence. Digits that are not yet entered appear as underscored blanks.

The new code is activated when the fourth digit is entered. Pressing the
CLR key moves the cursor back to the previous digit. Holding the CLR
key moves the cursor back to the
the cursor is on the first digit of the code,
during code entry, removes the cursor and cancels code entry.

Figure 2-1

2.4

Function

IDENT 

18 seconds, which distinguishes your transponder
controller’s screen. The word “IDENT”
display during this

Keys

The IDENT key activates the special position identification (SPI) pulse for

time.

first digit. Pressing the CLR key when

or pressing the CRSR key

Squawk Code Entry

will

appear in the upper left corner of the

Field

from others on the air traffic

VFR 

selected during installation configuration (this is set to 1200 at the
the VFR key again restores the previous identification code.

FUNC 

display. Menu groups include:

ENT  Acknowledges selection of menu items and pilot data entry
fields.

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VFR sets the transponder code to the preprogrammed VFR

Cycles through top level function groups shown on the right

• Transponder (XPDR)
Timers

System

(TMR)

(SYS)

•

• Altitude (ALT)

•

code, which is

fac

tory). Pressing

side of the

CRSR 

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Activates the cursor to select items in menus and on

pages.

CLR 

8/UP 

in menus and within top level function

9/DOWN 

Navigates down in menus and within top level function

Clears selected entry and exit

Enters the number eight in the Flight ID or Count Down

Enters the number nine in the Flight ID or Count

menus.

groups.

groups.

timer.

Down

Navigates up

timer.

190-01499-00 Rev. 1 Garmin GTX 3X5 Pilot’s Guide 2-3

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2-4 Garmin GTX 3X5 Pilot’s Guide 190-01499-00 Rev. 1

3 FEATURES AND SETTINGS

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3.1

Transponder

FLIGHT ID

1090ES TX CTRL

(XPDR)

This page displays the active Flight ID. Access to
pilot entry of the Flight ID is through this page
when allowed by the system.

This page displays the current ON/OFF state
1090ES ADS-B Out function. Access to pilot control of
the 1090ES ADS-B Out function
when allowed by system configuration.

of

the

is

through this page

UAT TX CTRL

190-01499-00 Rev. 1 Garmin GTX 3X5 Pilot’s Guide 3-1

This page displays the current ON/OFF state
ADS-B Out function.
ADS-B Out function is through this page when allowed by
system

configuration.

Access to pilot control of the UAT

of

the UAT

3.2

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TIMERS

UP

COUNTER

DOWN COUNTER

(TMR)

This page provides a stopwatch style counter,
with start/stop/reset controls via the ENT and
CLR keys.

This page provides a count down style timer,
with a notification, when the timer expires and
start/stop/set/reset controls via the ENT and CLR
keys.

FLIGHT TIMER

TRIP TIMER

3-2 Garmin GTX 3X5 Pilot’s Guide 190-01499-00 Rev. 1

This page provides an airborne flight timer
that starts and stops automatically with the
GTX’s automatic airborne determination. The
timer measures the elapsed airborne time since
the last on ground to airborne transition.
Manual start/stop/reset controls are available
via the ENT and CLR keys.

This page provides an airborne flight timer that starts

and stops automatically with the GTX’s automatic
airborne determination. The timer measures the
elapsed airborne time since the last manual reset of the
timer. Manual start/stop/reset controls are available via
ENT and CLR keys.

3.3

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ALTITUDE

PRESSURE ALT

(ALT)

ALT MONITOR

SAT/DALT

This page displays the current pressure

This page displays
desired altitude to maintain. The desired altitude is automatically
set when the altitude monitor
available via the CRSR and ENT

This page displays the current static air temperature (SAT) and

altitude (DALT), when

density

the

current altitude deviation from

is

available.

altitude

.

the

turned on. ON/OFF controls are
keys.

190-01499-00 Rev. 1 Garmin GTX 3X5 Pilot’s Guide 3-3

3.4 S

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YSTEM

(SYS)

BACKLIGHT – This page displays the current backlight level and

backlight level
and UP/DOWN

offset. The offset is pilot modifiable via the CRSR

keys.

3-4 Garmin GTX 3X5 Pilot’s Guide 190-01499-00 Rev. 1

CONTRAST – This page displays

and contrast level offset.
CRSR and UP/DOWN

MESSAGES

messages
key menu

BLUETOOTH

Bluetooth function.
placed into pairing mode when this page is

INTERNAL GPS

.

GPS
selection.

– This page displays the number of active system

. Viewing

selection.

– This page displays the status of the GTX 345

GPS position

The offset is pilot modifiable via the

keys.

active system messages is available via CRSR

The Bluetooth function

– This page displays the status of the internal

fix details are available via CRSR key menu

the

current contrast level

is

automatically

displayed.